Furnace-door.



G. DE GRAHL.

FURNACE DOOR.

APPLICATION FILED NOV. 11, 1909.

9'? 1,266 ten ed Sept. 27, 1910.

4 BHEBTS-SHEET l.

In e/n 2oz" fi m-is $22,52 is F'czZ THE "cram: r-srsnsym, WASHINGTON, 0. c.

G. DB GRAHL.

FURNACE DOOR.

APPLICATION FILED NOV. II 1909.

9?} ,266, Patented Sept. 27, 1910.

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$0,522.21 GZQ V G. DE GRAHL.

FURNACE DOOR.

APPLICATION FILED NOV. 11, 1909.

4 BHEETSSHEET 3.

THE Nbms PETERS co, WASHINGTON n c G. DE GRAHL.

FURNACE DOOR.

APPLICATION IILED NOV. 11, 1909.

9?1 66 Patented 861111.27, 1910.

4 SHEETS-SHEET 4.

STATFE PTN FURNACE-DOOR.

To all whom it may concern:

Be it known that I, GUSTAV DE GLAHL, a subject of the German Emperor, and residing at Zehlendorf, near Berlin, Germany, have invented certain new and useful Improvements in Furnace-Doors, of which the following is a specification.

My invention relates generally to furnacedoors and particularly to devices for introducing overgrate blast into the furnaces of locomotives.

As is wellknown the devices for introducing over-grate blast or secondary air into such furnaces are based upon the fact that, as soon as the regulating lever of the locomotive is moved over into the position in which the steam is shut off from the eylinder and from the blast, an auxiliary blast device is set in action by which the requisite air for combustion is drawn in. In devices of this type known heretofore steam is simultaneously admitted to an ejector which is hereby set in action and lifts the piston of a cataractby suction. The cataract piston is so connected with the furnace-door or with the valves situated in air-conduits at the sides of the furnace-door that on said cataract-piston being lifted the furnace-door or the valves arranged in the lateral air-eonduits are opened in order to allow overgrate blast to enter into the furnace. The devices described consequently necessitate a cataract which, as is well-known, does not act entirely reliably and readily gives rise to disturbances.

Now a primary object of my invention is to render an ejector and a cataract unnecessary. To this end I subject the furnacedoor to the influence of a spring and connect it by means of a rod with the regulator lever in such manner that on the latter being moved over into the position in which the steam is shut off from the cylinder and from the exhauster or blast-pipe the furnace-door is automatically unlocked by the rod and is automatically opened by the spring. The introduction of overgrate blast into the furnace is effected on the one hand through valves, or the like, arranged at the sides of the furnace-door, which valves open and close automatically according to the degree of the vacuum in the furnace, and on the other hand through the opened fnrnace- Specification of Letters Patent.

Application filed November 11, 1909.

Patented Sept. 27, 1910.

Serial No. 527,519.

door, which as just explained is thrown automatically into the partially open position on the regulator-lever being moved over into the position in which the steam is shut off from the cylinder and from the exhauster.

One preferred form of my invention is represented by way of example in the accompanying drawings, wherein Figure 1 is a front elevation of the same, Figs. 2 to 4 each a cross-section on an enlarged scale on the line CD in Fig. 1. the furnace-door beingshown closed, partially open and entirely open, respectively; F 5 shows on an enlarged scale a side elevation as seen looking in the direction of the an.- row E, (Fig. 1), the furnace-door being closed; Fig. 6 shows likewise on an enlarged scale a cross-section on the line AB of Fig. 1, the furnace-door being closed, and Figs. 7 and 7 a show an elevation of a loco-motive, divided in the plane X-X, provided with my new device, part of the same being shown in section.

Referring to the drawings, in the bearings 4t, 5 secured on the door frame 1 the shaft 6 is mounted with which the furnace-door 7 is rigidly connected. At each end of the shaft (5 there is supported a coimterweight 8 able to oscillate loosely within certain limits. Each of the counterweights 8 is provided with a handle 10 as well as an arm 9. By the side of the counterweights 8 sectors 11, 11 are fixed on shaft (3, each of which sectors is provided with two notches or recesses 43, 14. Each of the sectors 11 possesses two projections 12, 13. The distance between said projections 12, 13 is such that when the counterweight 8 is turned over in the direction of the arrow 25 (Fig. 2) the arm 9 of the counterweight does not coact immediately with projection 13 but freely travels a certain distance until it reaches the same. In the extension 14 of the bearing 1 and also in the extension 15 of the bearing 5 a shaft 16 is revolubly supported. The said shaft is at the one end surrounded by a coil spring 45; this is connected at 16 with the shaft 16 and at the other end with the extension 14 of the bearing 4, and tends to rotate the shaft in the direction of the arrow (Fig. 1). On the shaft 16 the bow-shaped lever 17 provided with a handle 15 is loosely pivoted. Said lever is provided with a tooth 417 which can be brought into engagement with the recess 48 in the one sector 11 (Figs. 2 and 3). On the shaft 16 the two arms 19, 19 are fixed rigidly. Of said arms, the lefthand one in Fig. 1 is situated by the side of the arm 17 and is provided with a projection 49 with which it engages arm 17.

By reference to the drawing it will be noted that the tooth 47 of the lever 17 cannot enter the recess 48 of the sector, as long as the projection 49 is in engagement with said lever. The two arms 19, 19 each carry a roller 20 and are provided underneath the same with a nose 21. The noses 21 are so arranged that they rest either against the projections 22 on the sectors 11 (Fig. 2) or can enter into the recesses 43 (Fig. 3) or 44 (Fig. 4) when the furnace-door is to be held closed (Fig. 2) or partially open (Fig. 3) or completely open (Fig. 4) respectively. )Vhen the furnace door is closed the tooth 47 can be inserted into the recess 48 by swinging the counterweights 8 in direction of the arrow (Fig. 2). Each counterweight is provided with two elevations 23 and 24 separated from each other by an interval and adapted to move the arm 19 by engaging the roller 20 of the same. )Vhen the counter weights are rotated the elevations act against the rollers 20 raising the arms 19, so that projection 49 of the same is swung back far enough to allow lever 17 to enter with its nose 47 into recess 48.

At each side of the door-frame a helical spring 27 is fastened at 26, which spring coacts with its end 28 with a projection 29 (Fig. 3) on the sector 11 and tends, after the door has been unlocked, to turn the sector 11 with the shaft 6 and the furnace-door 7 into the open position until the spring strikes against the pin which stops it from acting further on the furnace-door.

At 31 the well-known regulator-lever 32 is pivotally mounted. Said lever is rigidly connected with a lever 33 to which the links 34, 35 are pivoted. The links 34, 35 are pivotally connected with the revolubly-mounted lever 36 in such manner that the regulatorlever can transmit its rotary motion by means of the lever 33 and the links 34, 35 to the shaft 61 and to the lever 36 fixed on the same. On the link 34 an arm 38 is secured by means of fastenings 37 and said arm is able to act with its ends against the roller 39 on an angle-lever 41 fulcrumed at 40 on the door-frame; the other arm of the lever 41 engages under the projection 42 on the arm 19 fixed on the shaft 6.

The shaft 61 extends longitudinally through the uppermost part of the locomotive boiler and is supported at 62 at its inner end. Into the upper part of the steam-dome 63 there extends the steam-pipe 64 leading to the cylinder and to the exhauster or blastpipe 74, the mouth 65 of which pipe can be closed or opened by a. slide valve 66. The slide valve 66 is connected by a link 67 with an arm 68 secured on the shaft 61. Into the upper part of the steam-dome 63 there opens the pipe 69 the function of which is to supply steam to the auxiliary blast-device 70. In pipe 69 is provided a cook 71 whose spigot is provided with a lever 72 which engages in a slot 73 in the link 67 and consequently, when the shaft 61 turns and causes the link 67 to rise and sink and to actuate the slidevalve 66, the said lever is correspondingly turned. The arrangement is such that when the valve 66 shuts off steam at 65 and the lever 72 occupies its upper position, steam is admitted to the auxiliary blast-device 70, whereas on steam being admitted at inlet 65 steam is shut off from the auxiliary blastdevice 70.

The means represented in Fig. 7 for admitting steam to and shutting the same off from the auxiliary blast-device when the steam-pipe leading to the cylinder and to the blast-pipe is closed and opened have been represented only by way of example and may be replaced by other means.

The door-frame 1 is provided with the lateral air-conduits 2, 3 opening through slots 60 (Fig. 6) at two parts of the furnace situated opposite one another in the direct neighborhood of the furnace-door. In these air-conduits the air-valves 51, 52 are arranged which open in proportion to the vacuum in the furnace and then allow overgrate blast to enter into the furnace. It is obvious that instead of the valves 51, 52 other antomatically opening and closing controlling means may be employed without departing from the spirit and scope of the present invention.

The device according to my invention operates as follows \Vhen the furnace-door 7 is to be opened the counterweights S are first moved over in the direction of the arrow 25 (Fig. 2) by means of the handles 10. Hereupon the arms 9 on the counterweights move away from the projections 12 on the sectors 11 and move toward the projections 13 on the same. At the same time the elevations 23 on the naves of the counterweights act against the rollers 20 on the lever-arms 19, 19 and raise the same to such an extent that the sectors 11 are unlocked and that the furnace-door under the influence of the springs 27 is thrown into the partially open position as shown in Fig. 3. The distance moved through by the furnace-door is lim ited both by the pin 30 and also by the recesses 43 into which the noses 21 on the arms 19, 19 fall. The projections 13 on the sectors 11 are now away from the arms 9 on the counterweights 8. Vhile the furnace-door is thus partially open, so that overgrate blast can pass into the furnace, the fire can be raked. If coal is to be thrown onto the grate the counterweight must be turned over still farther in the direction of the arrow 25 (Fig. 2). Hereupon the arms 9 of the counterweights 8 again approach the projections 13 on the sectors 11. At the same time the elevations 2% on the sectors 11 act against the rollers 20 on the arms 19, 19 and lift the noses out of the recesses 43. If now the counterweights S are turned still farther in thedirection of the arrow 25 the arms 9 on the counterweights 8 coact with the projections 13 on the sectors 11 and drive the sectors 11 and also the door-shaft with them. As soon as the rollers 20 slide over the elevations 2st and leave the same, the noses 21 on the arms 19, 19 fall into the recesses 14; in the sectors 11. The furnace-door has now reached its completely open position. The noses 21 are pressed into the recesses 4L3 by the spring 45 which, as already mentioned, tends to turn the lever 16 in the direction of the arrow (Fig. 1). When the furnace-door is to be closed the counterweight 8 is turned back out of its position shown in Fig. 41 into its position shown in Fig. 2, so that the arms 9 on the counterweights are removed from the projections 13 on the sectors 11 and the noses 21 are raised by the elevations 2st out of the recesses 4.4. As soon as the arm 9 coacts with the projection 12 the sectors 11 with the door-shaft 6 are driven by means of the counterweights 8. Hereupon the projections 29 on the sectors 11 coact with the ends 28 of the springs 27. Consequently the springs 27 are tensioned again as soon as the furnacedoor has passed back into the posi tion shown in Fig. 2. The closed. furnacedoor is, however, also automatically brought into the partially open position when on the locomotive running into a station, or descending an incline, and so on, the regulatmlever is reversed and consequently steam is shut off from the cylinder and the blastpipe. In this case the regulator-lever 32 passes into the position indicated in Fig. 1 in dotted lines, and lifts arm 38 into the po sition likewise indicated by dotted lines. By means of the arm 38 the angle-lever 11 (Fig. 1) is rocked somewhat to the left and hereby coacts with the projection 42 on the arm 19. The consequence of this is that the arms 19, 19 are raised, the sectors 11, 11 unlocked and the furnace-door thrown into its partially open position by means of the springs 27 (Fig. By the regulatorlever 32 being turned into the position indi cated in Fig. 1 by dotted lines, the rotary motion of the same is transmitted in a wellknown manner through the links 34, 35 and the levers 33, 36 to the shaft 61 (Fig. 7). The latter executes a rotary movement corresponding to that of the regulator-lever and imparts the same through the arm 63 and the link (57 to the slide valve 66, which is moved into the position in which itshuts off the steam from the cylinder and the blastpipe. Simultaneously the lever 72 of the cook 71 is turned upward by the link 67 and the steam is hereby admitted to the auxiliary blast-device. If the stoker, after stoking, wishes to close the furnace-door 7 again without actuating the regulator-lever, the counterweight 8 merely requires to be turned back into the position indicated in Fig. 2 and the furnace-door to be closed thereby in opposition to the springs 27. In this case the door can be prevented from unintentionally opening under the action of the springs 27 by the tooth 47 on the lever 17 being placed in the recess 48 in the sector 11. If the regulator-lever on the locomotive starting again be moved over into the posi tion indicated by full lines, the stoker, in case it is necessary to charge the grate with coal, must release the lever 17 by hand. The lever 17 can then be moved over upward in order that it may not be in the stokers way while charging the grate.

From the above it is evident that overgrate blast is introduced into the furnace along two different paths, namely, through valves arranged at the sides of the furnacedoor, which valves open and close automatically according to the degree of the vacuum in the furnace, and also through the open furnace-door which is so arranged that it is automatically thrown into the partially open position when the regulator-lever is reversed into the position in which the steam is shut off from the cylinder and the blast.

I claim 1. In means for admitting over-grate blast to furnaces in locomotives the combination with the regulating lever of an inwardly opening pivoted furnace door, means for locking the door in its closed position, a spring tending to open the door, means for releasing said locking means and adapted to be actuated by said regulating lever, when the same is moved over into the position, in which the steam is shut off from the steam cylinder and the blast pipe.

2. In means for admitting overgrate blast to furnaces, the con'ibination, with the door frame, a shaft, carrying an inwardly-opening door, pivoted thereon, a segment having recesses, and a projection fixed on said shaft, and spring-pressed locking means adapted to engage with said segment, of a spring on said frame normally coacting with said projection and tending to open said door, and a pivoted lever adapted to release said locking means from said segment.

3. In means for admitting overgrate blast to furnaces, the combination, with the door frame, a shaft, carrying an inwardly-open- In testimony whereof, I affix my signature 111g door, plvoted thereon, and a segment 1n the presence of two wltnesses. having recesses and a projection fixed on A DE R HL. sald shaft, of a sprmg mounted on sald GUST V G A 5 frame and normally coactmg wlth sald pro- Wltnessesz ect1on and tendlng to open sald door, sub- FRIEDRICH ROKAHR,

stantially as shown. HENRY HAsPER. 

